MCP server

PromptFax Official

app.promptfax/promptfax

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

Send a one-off fax from inside ChatGPT or Claude. Pay-per-use, $2-$4.50 per delivered fax.

At a glance

Type

MCP server

Publisher

promptfax.app (verified by the MCP Registry)

Status

Working at last check

Tools

8

Token cost

About 2,855 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

28 Oct 2026, 09:03 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http promptfax https://promptfax.app/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.promptfax]
url = "https://promptfax.app/mcp"

Gemini CLI

{"mcpServers":{"promptfax":{"httpUrl":"https://promptfax.app/mcp"}}}

Cursor

{"mcpServers":{"promptfax":{"url":"https://promptfax.app/mcp"}}}

VS Code

{"servers":{"promptfax":{"type":"http","url":"https://promptfax.app/mcp"}}}

Antigravity

agy mcp add promptfax https://promptfax.app/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"promptfax","server_url":"https://promptfax.app/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"promptfax","server_url":"https://promptfax.app/mcp"}

Tools

• attach_document ~285 tokens
  Fallback/non-widget tool for binding a PromptFax document or one or more HTTPS PDF URLs into the current MCP session before requesting a quote. In ChatGPT widget sessions, prefer the widget's file controls after start_session instead of calling this tool unless the widget is unavailable or the user
• cancel ~155 tokens
  Use this when you need to cancel the active PromptFax send.
• checkout Moves money · ~302 tokens
  Fallback/non-widget tool for starting external Stripe Checkout after the user accepts a pay-per-use quote. Payment authorization is required before PromptFax can send; PromptFax treats webhook-confirmed authorization, not browser redirect, as payment truth. In ChatGPT widget sessions, do not call th
• get_quote ~342 tokens
  Fallback/non-widget tool for creating a user-reviewable pay-per-use fax quote when you have a fax number and either an MCP session, a PromptFax documentId, or one or more HTTPS PDF URLs. A quote is required before Stripe Checkout and before any real fax transmission. In ChatGPT widget sessions, do n
• get_status ~170 tokens
  Use this when you need the latest PromptFax workflow state, quote/payment state, or fax transmission status.
• retry_failed_fax ~209 tokens
  Use this after a retry-eligible failed fax to queue another attempt under the existing authorization. You may supply a corrected destination.
• send_fax Sends messages · ~212 tokens
  Fallback/non-widget tool for sending after payment is authorized and the user explicitly wants to send now. In ChatGPT widget sessions, do not call this after start_session unless the widget is unavailable or the user explicitly asks for fallback behavior.
• start_session ~1180 tokens
  Use this first when a user wants to send or price a fax. PromptFax is built for irregular, pay-per-use outbound faxing: every real send requires a user-reviewed quote and Stripe payment authorization before transmission. MCP clients should set hostType to identify their host: chatgpt, claude, browse

Browse

• Claude tools
• Stripe tools
• PDF tools
• Payments

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